Zack concentrated on the rubber ball. He envisioned a handball in his mind. Its rubbery texture, size and slight malleability stuck on his mind. He started to remember all the times he'd played with one, it bouncing off the wall right back at him. He heard a sound like the ball hitting the wall and bouncing back... only the sound was accompanied with glass breaking. Opening his eyes, he saw the rubber ball had bounced off a wall and knocked something glass off a table. His face reddened and he tried not to be noticed, sitting lower in his chair and meekly imagining the ball rolling slowly towards him.